QWidget, QFrame and QDialog transparency

[JonnyJP]

Hi, just a quick question.

If I set my QFrame or QDialog stylesheet to include

background-color:rgba(0,0,0,100);

background-color:rgba(0,0,0,100);

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and those objects have a parent, they are rendered with a semi-transparent black background which is fine.

If I set my QWidget to have that stylesheet then the background is opaque.

So I'm just wondering:

1. What properties do those classes have that allows the alpha channel to work?
2. Why is a parent needed for transparency?

I'm not struggling with the code, just wondering that's all

[Spitfire]

Parent isn't needed for transparency, but then you need translucent background attribute and frameless window hint set on that widget.
Look up Qt::WA_TranslucentBackground in the documentation for more info.

[JonnyJP]

Cheers, I'll have a look at this also